Behringer  SM200 Classic Attack Effects Make your guitar sound like a violin and experience a real cool 80's effect! Filters out the attack and swells the volume automatically Combine it with a delay pedal and you'll get the sound of a tape played backwards Dedicated Attack and Sensitivity controls for awesome sound shaping Blue status LED for effect on/off and battery check Runs on 9 V battery or the BEHRINGER PSU-SB DC power supply (not included)